DESCRIPTION ![]() The manifold absolute pressure sensor detects the intake manifold pressure as a change in voltage. The ECM calculates the intake manifold pressure based on this voltage. The ECM calculates the EGR valve assembly and purge VSV opening amount according to changes in the intake manifold pressure and also detects malfunctions of the manifold absolute pressure sensor using these changes in pressure.
HINT: When this DTC is output, check the intake manifold absolute pressure in the Data List. Enter the following menus: Powertrain / Engine / Data List / Intake Manifold Absolute Pressure.
If the Data List value is normal it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems. Click here
MONITOR DESCRIPTION The ECM monitors the manifold absolute pressure sensor voltage and uses this value to calculate the intake manifold pressure. When the manifold absolute pressure sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the manifold absolute pressure sensor circuit, illuminates the MIL and stores a DTC. Example: If the manifold absolute pressure sensor output voltage is less than 0.5 V for 0.5 seconds or more, the ECM stores this DTC. MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
CONFIRMATION DRIVING PATTERN HINT:
WIRING DIAGRAM ![]() CAUTION / NOTICE / HINT NOTICE:
HINT: Read Freeze Frame Data using the Techstream. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred. PROCEDURE
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HINT: Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again. (a) Disconnect the manifold absolute pressure sensor connector. (b) Turn the power switch on (IG). (c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(d) Turn the power switch off and wait for at least 30 seconds. (e) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Disconnect the manifold absolute pressure sensor connector. (b) Disconnect the ECM connector. (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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Toyota Avalon Service & Repair Manual > Oil Pump: Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE OIL PUMP RELIEF VALVE (a) Using a 27 mm socket wrench, remove the oil pump relief valve plug from the oil pump cover. (b) Remove the oil pump relief valve spring and oil pump relief valve from the valve hole. 2. REMOVE OIL PUMP COVER (a) Remove the 8 bolts and oil pum ...